AN INVESTIGATION ON THE BURST OF CENTRIFUGAL DRUM MADE OF OCr17Ni4Cu3Mo2NB STEEL

J Chin Soc Corr Pro

1999, Vol. 19

Issue (4): 250-256 DOI:

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AN INVESTIGATION ON THE BURST OF CENTRIFUGAL DRUM MADE OF OCr17Ni4Cu3Mo2NB STEEL

Zheng Wang;;

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Abstract The martensitic stainless steels of type OCr17Ni4Cu3 are extensively used in the chemical,petroleum and medicinal industry because they possess high strength,good mechanical property,simple heat-treatment process and excelent corrosion resistance.Although inliterature it has been indicated that "stress corrosion cracking for these steels may occur in some environments', no any detailed data and research reports were available.in the present work,the burst of centrifugal drum made of OCr17Ni4Cu3mo2Nb steel was systematically investigated.The results showed that the strength design,operational process,microstructure,chemical composition and mechanical properities of the device were quite right.however,its material,OCr17Ni4Cu3Mo2Nb steel,was foud to exhibit great susceptibility to SCC in 0.5mol/L NaCl+2.5mol/L H2SO4 solution at room temperature.The threshold stress intensity,K ISCC, was only 14MPam1/2 and the threshold stress,σth,was not higher than 150NPa,being 12percentage of its strength.Accordong to the fractography,experimental and calculated results,it was confirmed that the burst of the centrifugal drum was caused by environmental sensitive fracture.When the martensitic stainless steels were used their environmental fracture behavior should be considered carefully and the allowable load should not exceed the σth or K ISCC.

Key words: martensitic stainless steel stress corrosion cracking threshold stress threshold stress intensity

Received: 28 August 1998

Corresponding Authors: Zheng Wang

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Cite this article:

Zheng Wang. AN INVESTIGATION ON THE BURST OF CENTRIFUGAL DRUM MADE OF OCr17Ni4Cu3Mo2NB STEEL. J Chin Soc Corr Pro, 1999, 19(4): 250-256 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1999/V19/I4/250

1　葛志祺 .机械零件设计手册 (下 ) ,北京 :冶金工业出版社 ,1 994 (III) .3 52　
2　吴荫顺 .金属腐蚀研究方法 ,北京 :冶金工业出版社 ,1 993 .1 47-1 58

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